Question
Explain ac voltage applied on inductor and explain that when only pure inductor is joined in a circuit, the current lags emf by a phase angle of $\frac{\pi}{2}$.
✓
Answer
SELF
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The $\text{K}_\beta\ X-$rays from certain elements are given below. Draw a Moseley-type plot of $\sqrt{\text{v}}$ versus $Z$ for $\text{K}_\beta$ radiation.
→|
Element
|
$Ne$ | $P$ | $Ca$ | $Mn$ | $Zn$ | $Br$ |
|
Energy $(keV)$
|
$0.858$ | $2.14$ | $4.02$ | $6.51$ | $9.57$ | $13.3$ |
Suppose the rod with the balls A and B of the previous problem is clamped at the centre in such a way that it can rotate freely about a horizontal axis through the clamp. The system is kept at rest in the horizontal position. A particle P of the same mass m is dropped from a height h on the ball B. The particle collides with B and sticks to it:
- Find the angular momentum and the angular speed of the system just after the collision.
- What should be the minimum value of h so that the system makes a full rotation after the collision.
A pendulum bob of mass $80\ mg$ and carrying a charge of $2 \times 10^{-8}C$ is at rest in a uniform, horizontal electric field of $20kVm^{-1}$. Find the tension in the thread.
→What do you mean by angle of polarisation? Prove that reflected and refracted rays are mutually perpendicular for a ray incident at angle of polarisation.
A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increase or decrease? Explain.
A plane electromagnetic wave is passing through a region. Consider (a) electric field (b) magnetic field (c) electrical energy in a small volume and (d) magnetic energy in a small volume. Construct the pairs of the quantities that oscillate with equal frequencies.
A point object is placed at a distance of $15\ cm$ from a convex lens. The image is formed on the other side at a distance of $30\ cm$ from the lens. When a concave lens is placed in contact with the convex lens, the image shifts away further by $30\ cm.$ Calculate the focal lengths of the two lenses.
→Figure shows a square loop ABCD with edgelength a. The resistance of the wire ABC is r and that of ADC is 2r. Find the magnetic field B at the centre of the loop assuming uniform wires.
What is transformer ? Describe its construction and working principle.
Suppose the space between the two inner shells of the previous problem is filled with a dielectric of dielectric coastant K. Find the capacitance of the system between A and B.